Table 3 Dosimetric comparison of Standard IMRT plan, Sparing IMRT plan and VMAT planfor PTV 46 and 60 plans
Standard IMRT plan | Sparing IMRT plan | VMAT plan | p value | |
|---|---|---|---|---|
PTV46 max dose (Gy) | 46.9 (46.2-47.4) | 47 (46.5-47.6) | 47.5 (48.5-50.1) | 0.14 |
PTV46 mean dose (Gy) | 48.9 (48-50.4) | 49.3 (48.3-50.8) | 48.5 (47.9-50.4) | 0.21 |
D 95 46 (Gy) mean SD | 46 (45.7-46.3) | 46 (45.8-46.3) | 46.4 (45.8-46.8) | 0.55 |
PTV60 max dose (Gy) | 63.2 (60.7-62.2) | 63.4 (60.7-62.1) | 63.6 (61.2-62.6) | 0.44 |
PTV60 mean dose (Gy) | 61 (61-64.3) | 61.2 (62.4-64.9) | 61.4 (61.3-64.6) | 0.23 |
D 95 60 (Gy) | 60 (59.7-60.2) | 60 (59.9-60.3) | 60 (59.9-61.5) | 0.65 |
HI (60 Gy) | 1.03 (1.02-1.05) | 1.03 (1.02-1.04) | 1.03 (1.02-1.04) | 0.34 |
CI (60 Gy) | 1.2 (1-1.4) | 1.2 (1.1-1.6) | 1.2 (0.9-1.6) | 0.48 |
MU (0-60 Gy) | 1472 (1041-1834) | 1320 (1116-1993) | 994 (886-1150) | 0.01 |
Right lens max | 4.8 (2.5-9.3) | 5.2 (2.8-9.3) | 7.5 (4.1-10.8) | 0.1 |
Left lens max | 7.7 (4.6-10.3) | 6.1 (3.8-9.8) | 4.0 (3.7-9.9) | 0.001 |
Right eye mean | 8.3 (4-25.8) | 9.4 (5.1-16.7) | 10.3 (3.6-17.6) | 0.45 |
Left eye mean | 10.8 (4.2-19.7 | 9.4 (6.2-16.2) | 8.4 (5.9-16.3) | 0.023 |
Right optic nerve max | 35.1(29.2-41.0) | 35.7 (30.6-40.8) | 32.2 (25.2-39.1 | 0.65 |
Left optic nerve max | 36.1 (30.2-42.1) | 37.9 (32.4-43.5) | 33.2 (25.6-40.8) | 0.55 |
Optic chiasm max | 39.8 (33.7-45.6) | 43.2 (37.9-48.5) | 37 (29.6-45.2) | 0.7 |
Brainstem max | 51.1 (48.2-54.3) | 50.9 (48.3-54.5) | 50.1 (48.9-54.1) | 0.44 |